Abstract: In an exemplary embodiment, an indicator panel containing indicator elements and control switches is pivotal relative to the remainder of the control desk so as to be adjustable for optimum visibility in accordance with the position and height of the operator. The indicator panel may be held at the desired inclined position either by a pawl which can be automatically flipped over by manipulation of the panel for resetting of the panel or by means of a reversible electric drive.

Abstract: A pluggable high-amperage contact in which the connector receptacle is suspended by means of a joint orientable in all directions with the joint supported so that it is laterally moveable in a plane approximately normal to the longitudinal axis of the plug connector, thereby permitting proper mating of connectors which are not exactly aligned.

Abstract: The invention concerns a thyristor column with disc thyristors which are stacked on top of each other and are mounted resiliently. A heat sink, which serves simultaneously as a conductor of electric current, is interposed on each side of each disc thyristor. Between the heat sinks of succeeding disc thyristors, a spacer element is inserted, on which ferrite cores are lined up. In this embodiment, the transient current is limited by the choke formed by the spacer element and the ferrite cores. The resistors of the external R-C components can therefore be designed for less power.